A mechanical expansion valve

Abstract

The present invention provides a mechanical expansion valve, which belongs to the technical field of refrigeration components. It solves the problem that the existing mechanical expansion valve is difficult to achieve a large flow of refrigerant passing through when the evaporator is defrosted. The mechanical expansion valve includes a shell, a valve core 1, a valve core 2, a spring 1 and a spring 2. The shell has an interface 1 at one end where the valve core 1 is provided, and the shell has an interface 2 at the side of one end where the valve core 2 is provided. The shell is also provided with an electromagnetic component, which is located at the end of the shell where the valve core 2 is provided, and the electromagnetic component can pull the valve core 2 along the axial direction of the shell to slide in a direction away from the valve core 1. The mechanical expansion valve can quickly allow a large flow of refrigerant to pass through when the outdoor evaporator needs to be defrosted.

Description

Technical Field

[0001] The invention belongs to the technical field of refrigeration components and relates to a mechanical expansion valve. Background Art

[0002] The four major components of the compressor, condenser, expansion valve, and evaporator together constitute the refrigeration system. The expansion valve is an important component in the refrigeration system and is generally installed between the condenser and the evaporator. The expansion valve can pressurize the gas evaporated by the evaporator to liquefy into a high-temperature and high-pressure liquid refrigerant through the compressor, and throttle it through its throttle port to become a low-temperature and low-pressure mist-like liquid refrigerant. Then the refrigerant absorbs heat in the evaporator to achieve the refrigeration effect. The expansion valve controls the valve flow through the change of superheat at the end of the evaporator to prevent the occurrence of insufficient utilization of the evaporator area due to too small flow and insufficient evaporator area due to too much flow, and the refrigerant is not completely gasified and sucked into the compressor to produce liquid shock. The expansion valves that are more commonly used are electronic expansion valves and mechanical expansion valves. The electronic expansion valve controls the movement of the valve core through a rotary solenoid valve, thereby controlling the opening of the expansion valve and adjusting the refrigerant flow, while the mechanical expansion valve uses the pressure of the refrigerant itself to push the valve core to move to achieve flow regulation.

[0003] The electronic expansion valve is disclosed in the patent document (application number: 201811389329.6), which includes a valve seat, a valve stem assembly and a magnetic rotor assembly. The valve stem assembly includes a valve stem and a valve needle connected to the valve stem. The valve stem includes a threaded rod and a valve stem body. The threaded rod is screwed into a nut, and the threaded rod is connected to the magnetic rotor assembly of the electronic expansion valve. A coil is sleeved on the outside of the magnetic rotor assembly to form a rotary solenoid valve. The threaded rod is driven to rotate by the rotary solenoid valve to achieve flow regulation. That is, during the normal cooling or heating process of the air conditioner, the threaded rod needs to be driven to rotate by the rotating solenoid valve in real time to adjust the refrigerant flow. However, it is obvious that the rotary solenoid valve has a relatively complex structure and a relatively high cost. At the same time, the flow is adjusted by electronic control, resulting in low stability.

[0004] A mechanical expansion valve, such as the expansion valve disclosed in the patent document (application number: 201711366377.9), comprises a valve core 1 and a valve core 2. The valve core 1 has a through throttling hole, and the end face of the valve core 2 has a plug connector in a columnar shape that can be inserted into the throttling hole. The outer diameter of the plug connector is smaller than the outer diameter of the valve core 2. The valve core 1 and the valve core 2 are both pushed by a spring. When the plug connector is inserted into the throttling hole, a throttling channel is formed. As the refrigerant pushes the valve core 1 and the valve core 2 to move relative to each other, the cross-sectional area of ​​the throttling channel changes, thereby realizing flow regulation. That is, the mechanical expansion valve requires two sliding valve cores and two springs to realize flow regulation, and it is realized by the pressure of the refrigerant itself, so the cost is low and the stability is high, but the flow regulation precision is low. The degree is lower than that of the electronic expansion valve, but in actual use, such as when the outdoor temperature is low in winter, and the evaporator is set outdoors in a low temperature environment, when the indoor heating is on, the corresponding evaporator is cooled, that is, the evaporator is further cooled in the outdoor environment where the temperature is already low, and frost is prone to occur. Therefore, it is necessary to defrost the evaporator regularly, and defrosting is achieved by the reverse work of the refrigeration system, that is, cooling the room, and the corresponding evaporator is heated to achieve defrosting, but the process needs to be completed quickly to avoid long-term cooling of the room and affecting the indoor temperature. Rapid heating of the evaporator requires a large flow of refrigerant to push the valve core 2 to pass through the expansion valve, and the mechanical expansion valve uses the refrigerant itself to push the valve core 2 to compress the spring to open a larger opening, which is more difficult.

[0005] Under the inherent working principle of the mechanical expansion valve, the above problem should be how to improve it on the basis of retaining the original working principle of the mechanical expansion valve. In view of the fact that the smaller opening is caused by the difficulty of the refrigerant to push the valve core two over a large distance, it is easy to think of increasing the liquid receiving area of ​​the valve core two, thereby increasing the thrust on the valve core two, or reducing the elastic force of the spring to reduce the resistance to pushing the valve core two. However, since the refrigerant is also needed to push the valve core two to adjust the flow during normal refrigeration, the above changes will affect the flow regulation accuracy during normal refrigeration. Summary of the invention

[0006] The purpose of the present invention is to address the above problems in the prior art and to propose a mechanical expansion valve to solve the problem that the prior mechanical expansion valve is difficult to achieve a large flow of refrigerant passing through the evaporator when defrosting.

[0007] The objective of the present invention can be achieved through the following technical scheme: a mechanical expansion valve, comprising a tubular shell, a valve core 1 having a throttling hole, a valve core 2 having a plug connector at one end, a spring 1 and a spring 2, wherein the valve core 1 and the valve core 2 are both slidably arranged in the shell, the valve core 1 and the valve core 2 are respectively plugged into the throttling hole by the plug connector under the elastic force of the spring 1 and the spring 2, and a throttling channel capable of adjusting the flow rate of the refrigerant is formed between the plug connector and the wall of the throttling hole, the shell having an interface 1 at the end where the valve core 1 is provided, and is characterized in that the shell having an interface 2 at the side part of the end where the valve core 2 is provided, and an electromagnetic component is also provided on the shell, the electromagnetic component is located at the end of the shell where the valve core 2 is provided, and the electromagnetic component can pull the valve core 2 along the axial direction of the shell to slide in a direction away from the valve core 1.

[0008] The expansion valve is mechanical, and relies on the pressure of the refrigerant itself to push the valve core 1 and the valve core 2 to move, so as to achieve the passage of the refrigerant and flow regulation. It is quite different from the existing electronic expansion valve, which uses a single valve core, connects the valve core to the shell with a thread, and adjusts the flow by rotating the valve core through a rotary solenoid valve. The two are not comparable. Specifically, the valve core 1 and the valve core 2 of the mechanical expansion valve are pushed open by the refrigerant, wherein the interface 1 is the heating outlet, and the interface 2 is the cooling outlet. For example, when the air conditioner is cooling, the refrigerant flows into the interface 1 and pushes the valve core 2, and the valve core 2 moves relative to the valve core 1. The flow rate of the refrigerant is adjusted by changing the passing area of ​​the throttling channel. After the refrigerant passes through the throttling channel, it flows out from the second interface. On the contrary, when the air conditioner is heating, the refrigerant flows in from the second interface and pushes the valve core one. The valve core one moves relative to the valve core two, which can also change the passing area of ​​the throttling channel to adjust the flow rate of the refrigerant. After the refrigerant passes through the throttling channel, it flows out from the first interface. That is, this expansion valve still realizes the circulation and regulation of the refrigerant through a mechanical structure. When the outdoor temperature is low in winter and the indoor temperature is in heating, the corresponding outdoor unit evaporator refrigeration causes the aluminum fins of the heat exchange to frost. The frosting of the outdoor unit causes the heat exchange to fail to perform heat exchange according to the design requirements, resulting in a decrease in the heating efficiency of the air conditioner, or even failure to heat, so it is necessary to defrost the frost on the outdoor unit evaporator. The so-called defrosting is to switch the use method of the two heat exchangers of the air conditioner by using the air conditioner refrigeration, the outdoor unit discharges the heat, melts the frost on the outdoor unit heat exchanger, and restores the heat exchange performance of the outdoor unit heat exchanger. Since low-temperature heating and defrosting of the air conditioner is actually indoor refrigeration, heating is originally caused by the low indoor temperature, but the low-temperature heating and defrosting process is the reverse work of indoor refrigeration. In order to ensure the comfort of the indoor environment, the low-temperature heating and defrosting time is limited, that is, the indoor refrigeration time should be as short as possible. At this time, a larger flow rate of refrigerant with a self-adaptive flow-pressure relationship set by the mechanical expansion valve is required to make the outdoor heat exchanger quickly heat up. For this reason, an electromagnetic component is arranged on the shell of the expansion valve. The electromagnetic component only works when there is a defrosting demand, and the interface 2 is arranged on the side of the shell, leaving the end position of the shell to the electromagnetic component, so that the electromagnetic component can be realized along the The axial push-pull function pulls the valve core 2 to move quickly and compresses the spring 2 to separate from the valve core 1. The additional electromagnetic pulling force can cause the valve core 1 to produce the maximum displacement, and then quickly generate a throttling channel with the maximum passing area between the throttling hole wall and the outer wall of the plug connector, so that the refrigerant can pass through the outdoor evaporator in a large flow and quickly to heat and defrost the outdoor evaporator. That is, based on the original mechanical expansion valve, the present application still relies on the refrigerant's own pressure to achieve flow regulation during normal cooling or heating, and an electromagnetic component is added to provide pulling force for the valve core 2 only when the evaporator needs to defrost, so as to meet the mechanical expansion valve When the outdoor evaporator needs to defrost, a large flow of refrigerant can pass through quickly.

[0009] In the above-mentioned mechanical expansion valve, one end of the shell having the interface 2 is in an open shape, and the output end of the electromagnetic assembly extends from the end opening of the shell and is fixedly connected to the valve core 2. The interface 2 is arranged on the side wall of the shell, and the end of the shell is arranged in an open shape to meet the installation of the electromagnetic assembly, and the output end of the electromagnetic assembly actively extends into the shell to connect with the valve core 2, rather than the valve core 2 extending out of the shell to cooperate with the structure of the electromagnetic assembly, so that the original mechanical expansion valve is modified little and the cost is reduced.

[0010] In the above-mentioned mechanical expansion valve, the electromagnetic assembly includes a tubular shell, a cylindrical magnetic core and an electromagnetic coil. One end of the shell is fixedly connected to the end of the shell, and a plug is fixed to the other end. The magnetic core is slidably arranged in the shell, and the magnetic core is connected to the end of the valve core 2. The electromagnetic coil is fixedly sleeved on the shell, and the electromagnetic coil is opposite to the magnetic core. The spring 2 is arranged in the shell or the shell. That is, the electromagnetic assembly is direct-acting, and the electromagnetic coil drives the magnetic core to move unidirectionally in the axial direction, pulling the valve core 2 away from the valve core 1, so that the throttling channel is opened to the maximum, and the spring 2 is used to reset the valve core 2 and abut against the valve core 1. A space will be formed between the magnetic core and the plug, so the magnetic core is set in a cylindrical shape, and its inner hole is used to relieve the pressure between the magnetic core and the plug when the magnetic core moves axially, so as to ensure smooth movement.

[0011] In the above-mentioned mechanical expansion valve, the inner wall of the orifice of the magnetic core has a convex constriction portion circumferentially, the end of the valve core 2 is inserted into the inner hole of the magnetic core, and a connecting convex edge is circumferentially provided on the outer wall of the insertion end, the spring 2 is arranged in the magnetic core, and one end of the spring 2 abuts against the plug, and the other end abuts against the valve core 2, and the connecting convex edge abuts against the constriction portion under the action of the spring 2. The magnetic core of the electromagnetic assembly of this structure is directly connected to the valve core 2, that is, the spring 2 is used to press the connecting convex edge and the constriction portion to achieve connection, and the spring 2 has the function of connecting the valve core 2 and the magnetic core, and provides thrust for refrigerant flow regulation during normal cooling or heating.

[0012] In the above-mentioned mechanical expansion valve, a through hole is provided in the valve core 2, one end of which penetrates the outer peripheral wall of the valve core 2 and is connected to the interface 2, and the other end penetrates the end face of the valve core 2 and is connected to the inner hole of the magnetic core. When the magnetic core pulls the valve core 2, the refrigerant in the space between the magnetic core and the plug can enter the interface 2 through the inner hole of the magnetic core and the through hole in turn, thereby playing a role in pressure relief, ensuring that the valve core 2 moves smoothly and is accurately positioned.

[0013] In the above-mentioned mechanical expansion valve, the electromagnetic assembly also includes a pull rod, and the valve core 2 has a cylindrical portion on its end surface facing the magnetic core, one end of the pull rod is inserted into the cylindrical portion and riveted to the cylindrical portion, and the other end of the pull rod is plugged and fixedly connected to the magnetic core. The magnetic core is extended into the housing through the pull rod to connect with the valve core 2, and a cavity is formed on the peripheral side of the pull rod, wherein the pull rod is connected to the valve core 2, so the preload force of the spring 2 can be adjusted by setting the length of the pull rod, and the relative position relationship between the magnetic core and the valve core 2 can also be adjusted, thereby simultaneously ensuring the relative position accuracy of the magnetic core and the electromagnetic coil and the relative position accuracy of the valve core 2 and the valve core 1.

[0014] In the above mechanical expansion valve, a through hole 1 is radially provided on the magnetic core, the inner end of the through hole 1 is connected to the inner hole of the magnetic core, and the outer end is connected to the interface 2. The through hole 1 is used to release the pressure of the refrigerant in the space between the magnetic core and the plug. Of course, this structure requires that the outer diameter of the position where the through hole 1 is provided in the magnetic core is relatively reduced, thereby forming a gap with the inner wall of the tube shell for the refrigerant to pass through when the pressure is released.

[0015] In the above mechanical expansion valve, a through hole is provided in the valve core 2, one end of which penetrates the outer peripheral wall of the valve core 2, and when the valve core 2 is separated from the valve core 1, the through hole is connected to the throttling hole, and the other end of the through hole penetrates to the end face of the valve core 2, and a through hole 2 is provided on the pull rod, one end of which is connected to the interface 2, and the other end is connected to the other end of the through hole. After the pull rod is set, the interface 2 is connected to the cavity at the pull rod, so a through hole is provided on the valve core 2, and a through hole 2 is provided on the pull rod, so that the throttling channel is connected to the interface 2 through the through hole, the through hole 2, and the refrigerant for normal operation passes through.

[0016] In the above mechanical expansion valve, the inner hole wall of the magnetic core has a step surface, and the second spring is arranged in the magnetic core, and one end of the second spring abuts against the step surface of the magnetic core, and the other end abuts against the plug. This structure embeds the second spring into the electromagnetic assembly, so that the electromagnetic assembly can be assembled to the end of the shell when it is integrated, reducing the improvement cost.

[0017] In the above mechanical expansion valve, the inner wall of the shell has a circumferential abutment convex edge, the second spring is sleeved on the pull rod, and one end of the second spring abuts against the second end surface of the valve core, and the other end abuts against the abutment convex edge. The second spring of this structure is closer to the valve core, generating a more direct thrust on the second valve core, thereby ensuring the stability of the second valve core and the flow control accuracy.

[0018] Compared with the prior art, this mechanical expansion valve has the following advantages:

[0019] 1. Since an electromagnetic component is arranged on the shell, the electromagnetic component works only when there is a need for defrosting, pulling the valve core 2 to move quickly and compressing the spring 2 to separate from the valve core 1. The additional electromagnetic pulling force can make the valve core 1 produce the maximum displacement, and then quickly produce a throttling channel with the maximum passing area between the throttling hole wall and the outer wall of the plug connector, so that the refrigerant can pass through quickly with a large flow rate to heat and defrost the evaporator.

[0020] 2. Since the present application is based on the original mechanical expansion valve, the flow rate is still regulated by the refrigerant's own pressure during normal cooling or heating, and the advantages of the mechanical expansion valve's stable structure and low cost are retained. At the same time, an electromagnetic component is added to provide a pulling force for the valve core 2 only when the evaporator needs to be defrosted, so as to meet the rapid passage of a large flow of refrigerant when the evaporator needs to be defrosted.

[0021] 3. Since the existing electronic expansion valve requires a solenoid valve to control the valve core position in real time to adjust the refrigerant flow rate during normal cooling or heating, in order to ensure the adjustment accuracy, the valve core and the valve body need to be threadedly connected. Correspondingly, a rotary expansion valve is needed to accurately control the rotation angle and number of turns of the valve core to convert it into the axial movement distance of the valve core. Not only is the structure complex, but the cost of the rotary expansion valve is also high and the stability is poor. The present application does not require the electromagnetic component to provide power during normal cooling or heating. The electromagnetic component only provides pulling force when the evaporator needs to defrost. Therefore, the electromagnetic component does not need to control the size of its pulling force, and can release its maximum pulling force. The functional requirements of the electromagnetic component are low, making the electromagnetic component simple in structure, high in stability and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural cross-sectional view of a mechanical expansion valve.

[0023] Figure 2 yes Figure 1 A magnified view of the structure at center.

[0024] Figure 3 It is a structural cross-sectional view of the mechanical expansion valve in the second embodiment.

[0025] Figure 4 It is a structural cross-sectional view of the mechanical expansion valve in the third embodiment.

[0026] Figure 5 It is a structural cross-sectional view of the mechanical expansion valve in the fourth embodiment.

[0027] Figure 6 It is a structural cross-sectional view of the mechanical expansion valve in the fifth embodiment.

[0028] Figure 7 It is a structural cross-sectional view of the mechanical expansion valve in the sixth embodiment.

[0029] Figure 8 It is a structural cross-sectional view of the mechanical expansion valve in the seventh embodiment.

[0030] Fig. 9 It is a structural cross-sectional view of the mechanical expansion valve in the eighth embodiment.

[0031] Fig.10 It is a structural cross-sectional view of the mechanical expansion valve in the ninth embodiment.

[0032] In the figure, 1, shell; 11, valve body; 111, abutting convex edge; 113, connecting cavity; 12, heating output pipe; 121, through hole three; 13, cooling output pipe; 14, interface one; 15, interface two; 2, valve core one; 21, throttling hole; 22, throttling channel; 23, buffer cavity; 3, valve core two; 31, plug connector; 311, throttling wall; 32, connecting convex edge; 33, through hole; 34, cylindrical part ; 35. Limiting part; 36. Step limiting surface; 4. Spring 1; 5. Spring 2; 6. Electromagnetic assembly; 61. Tube shell; 62. Magnetic core; 621. Narrowing part; 622. Through hole 1; 623. Step surface; 624. Pressure relief groove; 63. Electromagnetic coil; 64. Plug; 65. Pull rod; 651. Through hole 2; 66. Limiting tube; 7. Limiting column; 71. Liquid through hole; 8. Filter screen; 9. Guide body. DETAILED DESCRIPTION

[0033] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0034] Embodiment 1:

[0035] like Figure 1 As shown, a mechanical expansion valve comprises a shell 1, a valve core 1 2, a valve core 2 3, a spring 1 4, a spring 2 5 and an electromagnetic assembly 6, wherein the shell 1 is tubular, comprising a valve body 11 and a heating output pipe 12, the electromagnetic assembly 6 comprises a tubular tube shell 61, a cylindrical magnetic core 62 and an electromagnetic coil 63, one end of the heating output pipe 12 is inserted into one end of the valve body 11 and fixedly connected, the other end of the heating output pipe 12 is an interface 14, a filter screen 8 is fixed inside the interface 14, the other end side of the valve body 11 has an interface 2 15, a refrigeration output pipe 13 is inserted and fixed in the interface 2 15, and a filter screen 8 is also fixed to the outer end of the refrigeration output pipe 13, one end of the tube shell 61 is inserted into the other end of the valve body 11 and fixedly connected, a plug 64 is fixed to the other end of the tube shell 61, the magnetic core 62 is slidably arranged inside the tube shell 61, the electromagnetic coil 63 is fixedly sleeved outside the tube shell 61, and the magnetic core 62 is opposite to the electromagnetic coil 63.

[0036] The valve core 1 2 is cylindrical and slidably arranged in the heating input pipe, the valve core 2 3 is cylindrical and slidably arranged in the valve body 11, the valve core 1 2 is close to the interface 1 14, the valve core 2 3 is close to the electromagnetic assembly 6, and the interface 2 15 is located on the side of the valve core 2 3, a throttling hole 21 is axially opened on the valve core 1 2, and a buffer cavity 23 is also opened at one end of the valve core 1 2 facing the valve core 2 3, the throttling hole 21 is connected with the buffer cavity 23, and a columnar plug joint 31 is provided on the end surface of the valve core 2 3 facing the valve core 1 2, the outer diameter of the plug joint 31 is smaller than the outer diameter of the valve core 2 3, and the other end of the valve core 2 3 is inserted into the magnetic core 62, and a connecting convex edge 32 is circumferentially provided on the outer wall of the end of the valve core 2 3 inserted into the magnetic core 62, and a constriction portion 621 is circumferentially provided at the inner hole of the magnetic core 62, and the connecting convex edge 32 is located on the inner side of the constriction portion 621, and a limiting tube 66 is also penetrated in the magnetic core 62. One end of the limiting tube 66 is fixedly connected to the end of the valve core 23, the spring 25 is arranged in the magnetic core 62 and sleeved on the limiting tube 66, and one end of the spring 25 abuts on the valve core 23, and the other end abuts on the plug 64, wherein in order to arrange the spring 25 in the magnetic core 62 and facilitate the electromagnetic component 6 to pull the valve core 23 to overcome the elastic force of the spring 25, the size of the spring 25 is reduced, on the contrary, in order that the miniaturized spring 25 can push the valve core 23 and the magnetic core 62 to reset, the outer diameter of one end of the magnetic core 62 facing the valve core 23 is smaller than the outer diameter of the other end, and the two outer peripheral walls with different outer diameters are connected by a conical surface, thereby reducing the resistance of the magnetic core 62 when it resets, and a limiting column 7 is fixed in the heating output pipe 12, the spring 14 is arranged between the valve core 12 and the limiting column 7, and one end of the spring 14 abuts on the valve core 12, and the other end abuts on the limiting column 7, combined with Figure 2 As shown, under the action of spring 1 4 and spring 2 5, the end of valve core 2 3 is inserted into the buffer cavity 23, and the end face of valve core 2 3 can abut against the bottom face of buffer cavity 23, and plug connector 31 is also inserted into throttling hole 21, wherein the outer peripheral wall of plug connector 31 is a plurality of throttling walls 311 with different outer diameters, and the outer diameter of throttling wall 311 gradually increases from one end toward valve core 1 2 to the other end, and a throttling channel 22 is formed between throttling wall 311 and the wall of throttling hole 21, and a through-liquid hole 71 is opened axially on limiting column 7.

[0037] Furthermore, since there is space between the magnetic core 62 and the plug 64 for the magnetic core 62 to retreat, in order to ensure that the space can release pressure when the magnetic core 62 moves, a through hole 33 is opened on the valve core 2 3, and the through hole 33 includes an axial section arranged along the axial direction of the valve core 2 3 and a radial section arranged along the radial direction of the valve core 2 3. The outer end of the axial section penetrates to an end face of the valve core 2 3 facing the plug 64, and the outer end of the radial section penetrates to the outer peripheral wall of the valve core 2 3 and is connected with the inner cavity of the valve body 11, and then connected with the interface 2 15. The inner end of the axial section is connected to the inner end of the radial section, so that the space between the magnetic core 62 and the plug 64 is connected with the interface 2 15 through the inner hole of the magnetic core 62 and the through hole 33. In order to ensure rapid pressure relief, a pressure relief groove 624 can also be opened along the axial direction on the outer wall of the magnetic core 62, and the two ends of the pressure relief groove 624 respectively penetrate to the two end faces of the magnetic core 62, and then communicate with the interface 2 15.

[0038] The interface 14 is a heating outlet, and the interface 2 15 is a cooling outlet. When the air conditioner is working, such as cooling, the refrigerant flows in from the interface 14 and pushes the valve core 2 3 through the liquid hole 71. The valve core 2 3 moves and opens relative to the valve core 2. The refrigerant flows out from the interface 15 after passing through the throttling channel 22. The flow area of ​​the throttling channel 22 can be changed by the pressure of the refrigerant to adjust the flow of the refrigerant. On the contrary, when the air conditioner is heating, the refrigerant flows in from the interface 15 and pushes the valve core 2. The valve core 2 moves and opens relative to the valve core 2 3. The refrigerant flows out from the interface 14 after passing through the throttling channel 22 and the liquid hole 71. The same can be done. The flow rate of the refrigerant is adjusted by changing the passing area of ​​the throttling channel 22. When the outdoor temperature is low in winter and the indoor temperature is heated, the corresponding evaporator cooling causes frost, a reverse working state is required, that is, rapid cooling of the indoor temperature and corresponding rapid heating of the evaporator to defrost. The electromagnetic coil 63 is energized to drive the magnetic core 62 to move toward the plug 64, and then pull the valve core to overcome the elastic force of the spring 25 and move away from the valve core 2. The additional electromagnetic pulling force can cause the valve core 2 to produce the maximum displacement, so that the throttling channel 22 is opened to the maximum opening, so that the refrigerant can flow quickly and quickly to heat the evaporator for defrosting.

[0039] Embodiment 2:

[0040] The structure of the mechanical expansion valve is basically the same as that of the first embodiment, except that Figure 3 As shown, the valve body 11 is relatively long, the end of the heating output pipe 12 extends into the valve body 11 and is fixed at the port position of the valve body 11, and the valve core 1 2 and the valve core 2 3 are both slidably arranged in the valve body 11.

[0041] Embodiment three:

[0042] The structure of the mechanical expansion valve is basically the same as that of the first embodiment, except that Figure 4As shown, the length of the valve body 11 is shorter, while the length of the heating output pipe 12 is longer. The end of the heating output pipe 12 extends into the valve body 11 and is close to the end of the tube shell 61. At this time, the valve core 1 2 and the valve core 2 3 are both slidably arranged in the heating output pipe 12. In order to ensure the passage of refrigerant, a through hole 3 121 is provided on the side wall of the heating output pipe 12 inserted into the valve body 11, and a plurality of through holes 3 121 can be provided. In order for the interface 2 15 to be connected with a plurality of through holes 3 121, a connecting cavity 113 is provided on the inner wall of the valve body 11, and the through hole 3 121 and the interface 2 15 are both connected with the connecting cavity 113.

[0043] Embodiment 4:

[0044] The structure of the mechanical expansion valve is basically the same as that of the first embodiment, except that Figure 5 As shown, the electromagnetic assembly 6 also includes a tie rod 65, the length of the valve body 11 is shorter, and the length of the heating output pipe 12 is longer, the valve core 1 2 and the valve core 2 3 are both slidably arranged in the heating output pipe 12, and the tie rod 65 is inserted into the valve body 11. The outer diameter of the tie rod 65 is smaller than the outer diameters of the valve core 2 3 and the magnetic core 62, so that a cavity is formed on the side of the tie rod 65, and a cylindrical portion 34 is provided on the end surface of the valve core 2 3 facing the magnetic core 62, one end of the tie rod 65 is inserted into the cylindrical portion 34 and riveted to the cylindrical portion 34, and the other end of the tie rod 65 is plugged and fixedly connected to the magnetic core 62, and the tie rod 65 is connected to the valve core 2 3. A through hole 651 is provided at one end of the connection, one end of the through hole 651 is connected to the interface 15, and the other end is connected to the through hole 33 of the valve core 3 for the passage of refrigerant, and a through hole 622 is radially provided on the side wall of the magnetic core 62, the inner end of the through hole 622 is connected to the inner hole of the magnetic core 62, and the outer end is connected to the interface 15 for pressure relief, and a step surface 623 is also circumferentially provided on the inner wall of the magnetic core 62, and a spring 25 is arranged in the magnetic core 62, and one end of the spring 25 abuts on the step surface 623 of the magnetic core 62, and the other end abuts on the plug 64.

[0045] Embodiment five:

[0046] The structure of the mechanical expansion valve is basically the same as that of the first embodiment, except that Figure 6As shown, the shell 1 adopts an integrated and tubular heating output pipe 12, one end of the heating output pipe 12 is an interface 14, and an interface 2 15 is provided on the side wall of the other end, and the cooling output pipe 13 is fixedly inserted in the interface 2 15, and one end of the tube shell 61 is directly fixedly sleeved on the other end of the heating output pipe 12, and the valve core 1 2 and the valve core 2 3 are both slidably arranged in the heating output pipe 12, and a cylindrical guide body 9 is fixed in the heating output pipe 12, and the valve core 2 3 is slidably penetrated in the guide body 9, and the guide body 9 provides a guide for its sliding, and a limiting portion 35 is provided on the outer wall of the valve core 2 3 in the circumferential direction, and the limiting portion 35 can be abutted against the end face of the guide body 9, and a connecting cavity 113 is provided in the guide body 9, and the through hole 33 on the valve core 2 3 and the cooling output pipe 13 are both connected to the connecting cavity 113 in the guide body 9.

[0047] Embodiment six:

[0048] The structure of the mechanical expansion valve is basically the same as that of the fifth embodiment, except that Figure 7 As shown, the limiting portion 35 is removed from the outer wall of the valve core 2 3 .

[0049] Embodiment seven:

[0050] The structure of the mechanical expansion valve is basically the same as that of the fifth embodiment, except that Figure 8 As shown, the tube shell 61 is relatively long, the heating input tube 12 is inserted and fixed in the tube shell 61, a hole is opened on the side wall of the tube shell 61, the end of the cooling input tube 13 is inserted into the hole of the tube shell 61 and fixed, the interface 2 on the heating input tube 12 is opposite to and connected with the cooling input tube 13, and two openings connected with the through hole 33 are opened on the side wall of the valve core 23, one opening is connected with the connecting cavity 113 in the guide body 9, and the other opening is connected with the interface 2 15.

[0051] Embodiment eight:

[0052] The structure of the mechanical expansion valve is basically the same as that of the seventh embodiment, except that Fig. 9 As shown, the connecting cavity 113 of the guide body 9 is directly connected to the second interface 15 through the side opening, so the through hole 33 of the second valve core 3 only needs to open an opening to communicate with the connecting cavity 113 .

[0053] Embodiment nine:

[0054] The structure of the mechanical expansion valve is basically the same as that of the seventh embodiment, except that Fig.10 As shown, the outer wall of the valve core 2 3 has a step limit surface 36 in the circumferential direction, and the step limit surface 36 can be abutted against the end surface of the guide body 9.

[0055] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0056] Although the terms such as housing 1, valve body 11, and abutting ridge 111 are used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A mechanical expansion valve, comprising a tubular shell (1), a valve core (2) having a throttling hole (21), a valve core (3) having a plug connector (31) at one end, a spring (4) and a spring (5), wherein the valve core (2) and the valve core (3) are both slidably arranged in the shell (1), and a buffer cavity (23) is further provided at one end of the valve core (2) facing the valve core (3), the throttling hole (21) is communicated with the buffer cavity (23), the valve core (2) and the valve core (3) are respectively plugged into the throttling hole (21) by the plug connector (31) under the elastic force of the spring (4) and the spring (5), and a throttling channel (22) capable of adjusting the flow rate of refrigerant is formed between the plug connector (31) and the hole wall of the throttling hole (21), the end of the valve core (3) is inserted into the buffer cavity (23), and the shell (1) has an interface (14) at one end provided with the valve core (2), characterized in that: The housing (1) has a second interface (15) on the side of one end on which the second valve core (3) is provided. The housing (1) is also provided with an electromagnetic component (6), which is located at the end of the housing on which the second valve core (3) is provided, and the electromagnetic component (6) can pull the second valve core (3) along the axial direction of the housing (1) to slide in a direction away from the first valve core (2).

2. The mechanical expansion valve according to claim 1, characterized in that: The housing (1) has an end with a second interface (15) which is open, and the output end of the electromagnetic component (6) extends into the end opening of the housing (1) and is fixedly connected to the second valve core (3).

3. The mechanical expansion valve according to claim 1 or 2, characterized in that: The electromagnetic assembly (6) comprises a tubular shell (61), a cylindrical magnetic core (62) and an electromagnetic coil (63); one end of the shell (61) is fixedly connected to the end of the housing (1), and the other end is fixedly provided with a plug (64); the magnetic core (62) is slidably arranged in the shell (61), and the magnetic core (62) is connected to the end of the valve core 2 (3); the electromagnetic coil (63) is fixedly sleeved on the shell (61), and the electromagnetic coil (63) is opposite to the magnetic core (62); the spring 2 (5) is arranged in the housing (1) or the shell (61).

4. The mechanical expansion valve according to claim 3, characterized in that: The inner wall of the orifice of the magnetic core (62) has a protruding necking portion (621) on the circumferential direction, the end of the valve core (3) is inserted into the inner hole of the magnetic core (62), and a connecting convex edge (32) is provided on the outer wall of the insertion end on the circumferential direction, the spring (5) is arranged in the magnetic core (62), and one end of the spring (5) abuts against the plug (64), and the other end abuts against the valve core (3), and under the action of the spring (5), the connecting convex edge (32) abuts against the necking portion (621).

5. The mechanical expansion valve according to claim 4, characterized in that: A through hole (33) is provided in the valve core 2 (3), one end of the through hole (33) passes through the outer peripheral wall of the valve core 2 (3) and is connected to the interface 2 (15), and the other end passes through the end surface of the valve core 2 (3) and is connected to the inner hole of the magnet core (62).

6. The mechanical expansion valve according to claim 3, characterized in that: The electromagnetic assembly (6) further comprises a pull rod (65), and the valve core 2 (3) has a cylindrical portion (34) on its end surface facing the magnetic core (62). One end of the pull rod (65) is inserted into the cylindrical portion (34) and riveted to the cylindrical portion (34), and the other end of the pull rod (65) is plugged and fixedly connected to the magnetic core (62).

7. The mechanical expansion valve according to claim 6, characterized in that: The magnetic core (62) is provided with a through hole 1 (622) in a radial direction, the inner end of the through hole 1 (622) is connected to the inner hole of the magnetic core (62), and the outer end is connected to the interface 2 (15).

8. The mechanical expansion valve according to claim 7, characterized in that: A through hole (33) is provided in the valve core 2 (3), one end of the through hole (33) penetrates the outer peripheral wall of the valve core 2 (3), and when the valve core 2 (3) is separated from the valve core 1 (2), the through hole (33) is connected to the throttling hole (21), and the other end of the through hole (33) penetrates to the end surface of the valve core 2 (3), and a through hole 2 (651) is provided on the pull rod (65), one end of the through hole 2 (651) is connected to the interface 2 (15), and the other end is connected to the other end of the through hole (33).

9. The mechanical expansion valve according to claim 6, characterized in that: The inner hole wall of the magnetic core (62) is provided with a step surface (623), the second spring (5) is arranged in the magnetic core (62), and one end of the second spring (5) abuts against the step surface (623) of the magnetic core (62), and the other end abuts against the plug (64).

10. The mechanical expansion valve according to claim 6, characterized in that: The inner wall of the housing (1) has a circumferentially abutting convex edge (111), and the second spring (5) is sleeved on the pull rod (65), with one end of the second spring (5) abutting against the end surface of the second valve core (3), and the other end abutting against the abutting convex edge (111).

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